|AIRLINE|ICAO|IATA|CALLSIGN|COMMENCED OPERATIONS|
|---|---|---|---|---|
|Air Uganda|UGA|U7|UGANDA|2007|
|Eagle Air (Uganda)|EGU|H7|AFRICAN EAGLE|1994|
|Fly540 Uganda|FUL||ORANGE CRANE|2008|
|Pearl Air Services|PBY||PEARL SERVICES||
|Royal Daisy Airlines|KDR|6D|DARLINES|2005|
|Skyjet Airlines|SJU|UQ|SKYJET|2003|
|Africa Safari Air|ASA|AS|ASA|2013|
|Uganda Air Cargo|UCC||UGANDA CARGO|1994|
|United Airlines Limited|||||

Question: what number of airlines use the first letter of their name in their icao?
Answer: 6